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JAAST Table of Content: June 2(3)

Research Articles

 

Sajjad Ali Khuhro, Hakim Ali Sahito*, Abdul Ghani Lanjar, Saeed Ahmed Khuhro and Abdul Waheed Solangi.        pp. 33 - 37

CARNIVORES SPIDERS FAUNA IN LADY’S FINGER, ABELMOSCHUS ESCULANTUS VEGETABLE CROP

 

           

Study was carried out in the vivo condition of okra vegetable crop for checking the predatory spiders on okra in the experimental area of Sindh Agriculture University, Tandojam during Kharif season, 2013. Okra crop was planted on February 15, 2013 in a row trial at 75 cm distance between row to row with 22.5 cm distance between plant to plant. The results revealed that population of predatory spiders varied between the crop seasons. The peak population of predatory was observed during the month of May and reached up to 8.00±0.33/plant. The feeding potential of predators in the laboratory condition was recorded where; wolf spider consumed (75.00%) mites, followed by fishing spider (60.50%) mites, yellow sac spider (55.00%) mites and false black widow spider (40.00%) white flies. The predatory spiders preferred mites than whitefly, thrips and jassid under laboratory conditions at temperature of 25±2ºC. The correlation of population of predatory spiders was positive and significant with temperature (r=0.475) while, positive and non-significant with relative humidity (r=0.078).

Keywords:  Sucking pests, Temperature and RH%, Carnivores, Lady’s finger.

Musa, J. J.1*, Adewumi, J. K.2, Ohu, J.3, Awokola, O. S.4, and Otache, M. Y.1.        pp. 38 - 44

STATISTICAL SEDIMENT YIELD FORECAST FOR SELECTED SOILS IN GIDAN KWANO NIGERIA

 

           

Soil erosion is a major factor of land degradation in some states in the central part of Nigeria. This results in the loss of nutrient-rich topsoil causing severe agricultural problems for a society like Nigeria. Thus in this study, evaluation of sediment yield was done. To this end, watershed sediment yield data were evaluated for five different types of soil on the irrigation farm site of the Federal University of Technology, Minna Nigeria. A 22.9m by 2m of land was set up in areas where the various types of soil were identified for three rainy seasons during each rainfall event, runoff and sediment load produced were channelled through a collector placed at the lower end of the plot. The statistical mean value for the data collected during the month of July for the three years was 3.58, the forecast mean was 3.80 and the mean absolute percentage error, 20.82%. The mean average value for that of August for the field and forecasted sediment yield, error and percentage error were determined to be 3.47,3.80, -0.33 and 24.03%, respectively. It was concluded that sediment yield increased in some cases which was attributed to the surface runoff with an increase in slope steepness. Total sediment yield for the undisturbed soil surfaces was generally smaller than that for the disturbed surface conditions.

Keywords:  Disturbed soil, RUNOFF; soil erosion; sediment yield; surface slope; undisturbed soil.